Chemical Engineering Thermodynamics
Which of the following processes can not be made reversible even under ideal condition of operation?

Compression of air in a compressor
Expansion of steam in a turbine
Free expansion of a gas
All of these

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Chemical Engineering Thermodynamics
The second law of thermodynamics states that

The energy change of a system undergoing any reversible process is zero
It is not possible to transfer heat from a lower temperature to a higher temperature
None of these
The total energy of system and surrounding remains the same

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